Arsenal manager Arsene Wenger has confirmed that Lukas Podolski's hamstring injury is more serious than first thought, ruling the forward out of action for eight to ten weeks.
Podolski suffered the problem early in the second half during Tuesday's 2-0 win over Fenerbahce at the Emirates, pulling up suddenly in pain as he sprinted down the touchline.
Wenger has pleaded for patience from Gunners fans but admitted that the news has come as a blow to his plans, with the German international now facing at least two months on the sidelines.
He told the club's official website this morning: "It is bad news about Lukas Podolski as he will be out for eight to 10 weeks.
"His hamstring is much more damaged than we thought at the start. It is very disappointing and we have paid a very heavy price for that win [over Fenerbahce]. We have to be patient now."
The Gunners are currently in the midst of an injury crisis which has hampered their start to the campaign, with Podolski joining club captain Thomas Vermaelen and Mikel Arteta on the long-term injury list.
Midfield duo Aaron Ramsey and Jack Wilshere are also minor injury doubts for Sunday's north London derby against Spurs at the Emirates, but are both expected to be passed fit to play following fitness tests later this week.
Wenger now has four days to strengthen his forward-line before the transfer window closes, with Olivier Giroud and Yaya Sanogo the only recognised central strikers currently at his disposal.
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